Journal
SURFACE & COATINGS TECHNOLOGY
Volume 203, Issue 20-21, Pages 3111-3115Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2009.03.035
Keywords
High-current-density electroplating; Alkaline zinc cyanide-free bath
Funding
- National Science Council of the Republic of China [NSC 97-2221-E-007-078MY3]
- NTHU
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The effect of polyamine additives and quaternized pyridine carboxylic acid (an inner compound) on the zinc deposition behavior in alkaline zinc cyanide-free baths is systematically studied in this work. The morphology and crystalline structure of various Zn deposits are examined by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. All deposits prepared for the textural analyses are prepared under a direct-current electroplating mode at a current density of 100 mA cm(-2) (i.e., the high-current-density (HCD) zinc deposits for industry usage). Dependence of the electroplating behavior of Zn on the charge density of polyamines is discussed in order to gain an understanding on how to develop an alkaline zinc cyanide-free bath for the HCD Zn plating process. (C) 2009 Elsevier B.V. All rights reserved.
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